Truman Capote was a monster; after "In Cold Blood," he wrote a bitchy story about a friend, and the friend killed herself. His remarks on Marlon Brando were so scathing, they led Brando to retreat from the spotlight (temporarily). Capote gave little (if any) credit to Harper Lee, though Lee clearly did heavy lifting on the Clutter story. Capote claimed to have a deep interest in the Clutters, but he didn't really write much about them, and he felt free to invent lies. (Living Clutter relatives are still indignant to this day.) The bulk of "In Cold Blood" is a love letter to a murderer, Perry Smith, and the lies are rampant here, as well. Smith was not a deep soul; he was a killer. He did not apologize to his victims. He did not offer a concise explanation of his motives. (Capote would have you think otherwise.) A recent study of "In Cold Blood" suggests a motive that Capote himself overlooked. Perry Smith and Richard Hickock were obviously lovers; Cap...